2009 CHEVROLET HHR sensor

Region A Gage and Speedometer
Displays
Change the information displayed in Region A by
turning the knob either clockwise or counterclockwise.
The available gages are:
BOOST:Displays positive boost pressure as
determined by the manifold air pressure (MAP) sensor.
AIR/FUEL RATIO:Displays the mass ratio of air
to fuel.
CAM PHASER ANGLES:Displays orientation of the
intake and exhaust cam shafts relative to their park
positions as commanded by the engine control module.
OVERLAP represents the total distance the intake and
exhaust cam shafts have phased.
SPARK ADVANCE/ KNOCK RETARD:The spark
advance gage displays ignition timing. Knock retard
indicates the amount of ignition delay to reduce spark
knock.
ENGINE POWER & TORQUE:Displayed engine power
and torque are engine ywheel output values calculated
by the engine control module. These values are
approximate and may change with the air conditioning
load, generator output, air temperature, air pressure, and
fuel octane.SPEEDOMETER&GFORCE:The G FORCE meter
displays lateral acceleration. While turning right, G forces
are felt on the left, and vice versa. PEAK values are
stored indenitely, and can be reset with a press and hold
of the RPD knob while viewing the G FORCE meter.
SETUP MENU:Press the RPD knob to enter this menu.
The vehicle should be stopped while conguring the
setup menu selections.
SCREEN OFF:Turns the screen off.
Region B Readout Displays
Press the RPD knob to highlight Region B. The
information displayed can be changed by turning
the RPD knob either clockwise or counterclockwise.
Press the RPD knob again, to store the selection.
The selection will also be stored after a few seconds
of no activity. Available modes are:
Readouts #1
SHIFT LIGHTS/GEAR INDICATION:The shift lights
provide visual identication of engine speed for a
transmission gear. Shift light minimum and maximum
RPM settings can be viewed and congured in the
SETUP screen.
3-44

Readouts #2
TIRE PRESSURES:Displays the last gage tire
pressures recorded from each of the wheel mounted
tire pressure sensors.
Readouts #3
BAROMETER:Displays ambient air pressure as
measured by the engine’s ambient pressure sensor.
OUTSIDE TEMPERATURE:Displays ambient
temperature as measured by an outside air temperature
sensor.
BATTERY VOLTAGE:Displays the vehicle’s battery
voltage.
Readouts #4
COOLANT TEMPERATURE:Displays engine coolant
temperature as measured by a coolant temperature
sensor.
INLET AIR TEMPERATURE:Displays the
instantaneous temperature of the air at the inlet to the
induction system.
FUEL PRESSURE:Displays fuel pressure as
measured by a sensor on the output of the
high-pressure fuel pump.
INDICATORS
The indicators come on when the corresponding function
is actively working to stabilize or control the vehicle. Each
indicator light on the RPD display can be turned on and
off using the SETUP MENU. These indicators work
independently of the telltales on the instrument panel
cluster. Turning the indicator on the RPD display on or off
does not enable or disable the functions on the vehicle.
This indicator comes on whenever the vehicle
StabiliTrak
®is actively working.
3-45

ESC (Electronic Stability Control) NOT
READY
If your vehicle has Electronic Stability Control (ESC), this
message may display briey after starting the vehicle if
the system’s sensors are not yet calibrated. The system
is not functional until the message stops displaying.
Adjust your driving accordingly. When the message is no
longer displayed, the system is functional. SeeElectronic
Stability Control (ESC) on page 4-7for more information.
ESC (Electronic Stability Control) OFF
If your vehicle has Electronic Stability Control (ESC),
this message displays and the ESC/TCS light on the
instrument panel cluster comes on solid when ESC is
turned off. Adjust your driving accordingly. SeeElectronic
Stability Control (ESC) on page 4-7andElectronic
Stability Control (ESC)/Traction Control System (TCS)
Indicator/Warning Light on page 3-35for more
information.
GATE AJAR
This message displays when the liftgate is open. Make
sure that the liftgate is closed completely. SeeLiftgate
on page 2-12for more information.
ICE POSSIBLE
This message displays when the outside air temperature
is cold enough to create icy road conditions. Adjust your
driving accordingly.
KEY FOB BATT (Battery) LOW
This message displays if the Remote Keyless Entry
(RKE) transmitter battery is low. Replace the battery in
the transmitter. See “Battery Replacement” under
Remote Keyless Entry (RKE) System Operation on
page 2-4.
LAUNCH CONTROL
If your vehicle has this feature, this message displays
after the COMPETITIVE MODE message when the
vehicle is stopped. Launch control is a form of traction
control to control wheel spin while launching the vehicle
during closed track events and competitive driving
venues. The system will exit to COMPETITIVE MODE
after the vehicle is launched. See “COMPETITIVE
MODE” earlier in this section. See “Launch Control”
underElectronic Stability Control (ESC) on page 4-7for
more information.
3-53

To inspect or replace the lter, do the following:
1. Disconnect the Mass Air Flow sensor, PCV hose,
and both ducts.
2. Pull the entire system from the top of the engine.
3. Turn the system over and place it on a soft,
non-abrasive surface.
4. Remove the screws that hold the housing and
cover together and lift off the housing.
5. Inspect or replace the engine air cleaner/lter.
6. Reverse the steps to reinstall the system. Be sure
to reinstall the housing tightly.How to Inspect the Engine Air
Cleaner/Filter (2.0L Engine Only)
SeeEngine Compartment Overview on page 5-14for
the location of the engine air cleaner/lter.
To inspect the air cleaner/lter remove the lter from the
vehicle and lightly shake the lter to release loose dust
and dirt. If the lter remains caked with dirt, a new lter is
required. Never use compressed air to clean the lter.
Because this operation can be a little difficult, you may
choose to have this done at the dealer/retailer service
department.
5-24

How to Check
Use a good quality pocket-type gage to check tire
pressure. You cannot tell if your tires are properly
inated simply by looking at them. Radial tires
may look properly inated even when they are
under-inated. Check the tire’s ination pressure
when the tires are cold. Cold means your vehicle
has been sitting for at least three hours or driven
no more than 1 mile (1.6 km).
Remove the valve cap from the tire valve stem.
Press the tire gage rmly onto the valve to get a
pressure measurement. If the cold tire ination
pressure matches the recommended pressure on
the Tire and Loading Information label, no further
adjustment is necessary. If the ination pressure
is low, add air until you reach the recommended
amount.
If you overll the tire, release air by pushing on
the metal stem in the center of the tire valve.
Re-check the tire pressure with the tire gage.
Be sure to put the valve caps back on the valve
stems. They help prevent leaks by keeping out dirt
and moisture.
Tire Pressure Monitor System
The Tire Pressure Monitor System (TPMS) uses radio
and sensor technology to check tire pressure levels. The
TPMS sensors monitor the air pressure in your vehicle’s
tires and transmit tire pressure readings to a receiver
located in the vehicle.
Each tire, including the spare (if provided), should be
checked monthly when cold and inated to the ination
pressure recommended by the vehicle manufacturer
on the vehicle placard or tire ination pressure label.
(If your vehicle has tires of a different size than the size
indicated on the vehicle placard or tire ination pressure
label, you should determine the proper tire ination
pressure for those tires.)
As an added safety feature, your vehicle has been
equipped with a tire pressure monitoring system (TPMS)
that illuminates a low tire pressure telltale when one
or more of your tires is signicantly under-inated.
Accordingly, when the low tire pressure telltale
illuminates, you should stop and check your tires as
soon as possible, and inate them to the proper pressure.
Driving on a signicantly under-inated tire causes the
tire to overheat and can lead to tire failure. Under-ination
also reduces fuel efficiency and tire tread life, and may
affect the vehicle’s handling and stopping ability.
5-62

Tire Pressure Monitor Operation
This vehicle may have a Tire Pressure Monitor System
(TPMS). The TPMS is designed to warn the driver when a
low tire pressure condition exists. If your vehicle has this
feature, TPMS sensors are mounted onto each tire and
wheel assembly, excluding the spare tire and wheel
assembly. The TPMS sensors monitor the air pressure in
the vehicle’s tires and transmits the tire pressure readings
to a receiver located in the vehicle.
When a low tire pressure
condition is detected, the
TPMS turns on the low tire
pressure warning light
located on the instrument
panel cluster.
At the same time a message to check the pressure in a
specic tire appears on the Driver Information Center
(DIC) display. The low tire pressure warning light and the
DIC warning message come on at each ignition cycle
until the tires are inated to the correct ination pressure.Using the DIC, tire pressure levels can be viewed by the
driver. For additional information and details about the
DIC operation and displays seeDIC Operation and
Displays on page 3-48andDIC Warnings and Messages
on page 3-50.
The low tire pressure warning light may come on in cool
weather when the vehicle is rst started, and then
turn off as you start to drive. This could be an early
indicator that the air pressure in the tire(s) are getting
low and need to be inated to the proper pressure.
A Tire and Loading Information label shows the size of
your vehicle’s original equipment tires and the correct
ination pressure for your vehicle’s tires when they are
cold. SeeLoading the Vehicle on page 4-25, for an
example of the Tire and Loading Information label and
its location on your vehicle. Also seeInflation - Tire
Pressure on page 5-61.
Your vehicle’s TPMS system can warn you about a low
tire pressure condition but it does not replace normal
tire maintenance. SeeTire Inspection and Rotation
on page 5-67andTires on page 5-53.
Notice:Liquid tire sealants could damage the Tire
Pressure Monitor System (TPMS) sensors. Sensor
damage caused by using a tire sealant is not covered
by your warranty. Do not use liquid tire sealants.
5-64

TPMS Malfunction Light and Message
The TPMS will not function properly if one or more of the
TPMS sensors are missing or inoperable. When the
system detects a malfunction, the low tire warning light
ashes for about one minute and then stays on for the
remainder of the ignition cycle. A DIC warning message
is also displayed. The low tire warning light and DIC
warning message come on at each ignition cycle until the
problem is corrected. Some of the conditions that can
cause the malfunction light and DIC message to come
on are:
One of the road tires has been replaced with the
spare tire. The spare tire does not have a TPMS
sensor. The TPMS malfunction light and DIC
message should go off once you re-install the
road tire containing the TPMS sensor.
The TPMS sensor matching process was started but
not completed or not completed successfully after
rotating the vehicle’s tires. The DIC message and
TPMS malfunction light should go off once the TPMS
sensor matching process is performed successfully.
See “TPMS Sensor Matching Process” later in this
section.
One or more TPMS sensors are missing or
damaged. The DIC message and the TPMS
malfunction light should go off when the TPMS
sensors are installed and the sensor matching
process is performed successfully. See your dealer/
retailer for service.
Replacement tires or wheels do not match your
vehicle’s original equipment tires or wheels. Tires
and wheels other than those recommended for your
vehicle could prevent the TPMS from functioning
properly. SeeBuying New Tires on page 5-70.
Operating electronic devices or being near facilities
using radio wave frequencies similar to the TPMS
could cause the TPMS sensors to malfunction.
If the TPMS is not functioning it cannot detect or signal a
low tire condition. See your dealer/retailer for service if
the TPMS malfunction light and DIC message comes on
and stays on.
5-65

TPMS Sensor Matching Process
Each TPMS sensor has a unique identication code. Any
time you replace one or more of the TPMS sensors or
rotate the vehicle’s tires, the identication codes need to
be matched to the new tire/wheel location. The sensors
are matched, to the tire/wheel locations, in the following
order: driver side front tire, passenger side front tire,
passenger side rear tire, and driver side rear tire using
a TPMS diagnostic tool. See your dealer/retailer for
service.
The TPMS sensors can also be matched to each
tire/wheel position by increasing or decreasing the tire’s
air pressure. When increasing the tire’s pressure, do
not exceed the maximum ination pressure indicated on
the tire’s sidewall. To decrease the tire’s air-pressure
use the pointed end of the valve cap, a pencil-style
air pressure gage, or a key.
You have two minutes to match each tire and wheel
position. If it takes longer than two minutes to match any
tire and wheel position, the matching process stops and
you need to start over.
The TPMS matching process is outlined below:
1. Set the parking brake.
2. Turn the ignition switch to ON/RUN with the
engine off.3. Press and hold the Remote Keyless Entry (RKE)
transmitter’s LOCK and UNLOCK buttons, at the
same time, for about ve seconds to start the TPMS
learn mode. The horn sounds twice indicating the
TPMS receiver is ready and in learn mode.
4. Start with the driver side front tire. The driver side
front turn signal also comes on to indicate that
corner’s sensor is ready to be learned.
5. Remove the valve cap from the tire’s valve
stem. Activate the TPMS sensor by increasing
or decreasing the tire’s air pressure for about
eight seconds. The horn chirp, can take up to
30 seconds to sound. It chirps one time and then
all the turn signals ash one time to conrm the
sensor identication code has been matched to
the tire/wheel position.
6. The passenger side front turn signal comes on to
indicate that corner sensor is ready to be learned.
Proceed to the passenger side front tire and
repeat the procedure in Step 5.
7. The passenger side rear turn signal comes on to
indicate that corner sensor is ready to be learned.
Proceed to the passenger side rear tire and
repeat the procedure in Step 5.
5-66